[flac-dev] Lets do a 1.3.2 release

lvqcl
Tue, 19 Jan 2016 21:04:44 -0000

Dave Yeo wrote:

>> I cannot find information what version of binutils supports
AVX/AVX2/FMA
>> instructions, but IIRC OS/2 doesn't support AVX instructions
anyway,
>> so it doesn't matter much.
>
> Surprisingly, I've yet to have a report of an AVX related crash or trap
> (used in FFmpeg and projects based on it, Mozilla, probably others).
> As I understand it, support is a matter of saving the extended registers
> during a context switch and perhaps our kernel had some future proofing
> added towards the end.

WinXP/Vista also don't support AVX but ffmpeg doesn't crash there.

IIRC, OS must explicitely enable AVX support, and an application must check
whether the OS supports AVX or not.